The Application Research Of GPS And GIS Techniques In ITS System

With the fast development of modernization process of china and the repid construction of national highway networks, our car possession is increasing quickly, which lead to such problems as frequent traffic accident, traffic blocking and environment pollution. It has become global social defects, just as what the developed countries are suffering from. A key solution to these problems is to develop intelligent traffic system, in addition to constructing more traffic engineering establishment. In this paper, the application of techniques of GPS and GIS in the main information platform of ITS as well as the design and implementation of a regional intelligent traffic system based on CORBA are studied. This system is the foundation of intelligent traffic, which will be extended to bacome an intelligent traffic system.In this paper, a thorough study is performed on the concepts, theory and means of realization of GPS in ITS, with the emphasis on the positioning principle and positioning algorithm. A measure model is presented based on random complex figure algorithm combined with Karman filtering theory, and realizes the model with software and hardware. For the techniques of GIS in ITS, current research focuses: WebGIS, spatial data mining as well as their application in ITS are studied, and applies outlier detection method of spatial data mining to ITS.In the construction of ITS application platform, the relational techniques about broker are studied, and applies CORBA frameworks based on distributed computing environment to ITS, and constructs distributed computing environment based CORBA making full use of object model.In the direction of national ITS framework, combining Shaanxi regional ITS framework, this paper presents model of Shaanxi regional ITS framework emphasized on the construction of application framework of CORBA based Shaanxi public security compositive information management system, and presents B/S system model, the program source code of client and server as well as an instance.The factors affecting system performance are analyzed, and measures to enhance system performance are presented from the aspect of CORBA optimization and system network topology optimization respectively. For network topology optimization, as it is an NP hard problem, so it is difficult to resolve it with common methods. This paper builds a mathematic model for this problem, and designs an algorithm with generic algorithm, provides specific steps to realize this algorithm.